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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c40856740e4ed602eb1e4b2c69f1c954bc576a1faafbf6b8616f9f5fbb4a0eda' 
  AND token = 'QX/uKnbAv5i53YpiDnjgcmB13ERd1XeWMyJ0vVgTgEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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