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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a397054bebd0de6a1b8a5ed7a9a4b06f158103b0eacd0d62b456df2505b0e44' 
  AND token = 'okQrzFiXCYJVAEhJB12Ei1mcpt1nRIppOtT9iwHuxzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}