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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92de4d4468a5b2d476c2627864e14be47a01986eae395ec82c2facf90ac3cf02' 
  AND token = '648lN5puABmUdmTiSr1++ZUhhey9yJ7N7csJeiYtKuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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