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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6debdea2e52971b1ad1fc2f3a9991cd10c61ab958dbec3a9f864f2cd642574' 
  AND token = 'BXbWHi7ayUgFxHSERaaVGmhTUulho0H9ETQYT4Pk8qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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