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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '813d2a2512ff3ca6725335cd4847e8d27ef5683ecdb47d4e0d32cdd6f00f5594' 
  AND token = 'eICZeI3a+RB0XbPrz201G2D2ohTEa1QNKsfXua12RKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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