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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15eec71507bd54056f970af3fffd78c8c880b22a030cc285985e7609841bcfc5' 
  AND token = 's0jahTyOQmm3HqnR1NIUpHawcUqPHrZLCkJvTyfn8j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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