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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763a018d4091fe077e93d7b1331b5cd77702cf279373fb9812c8063addab8149' 
  AND token = 'lZOnR11cBmPn/B7pIepEMAVRnfy1CQ6kR3HL5P1ql5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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