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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c841d64d15072412bebe1524530933754355316af8c8848b9acdc345e874a515' 
  AND token = 'niWeA1m7EBw9yVHdk4N21u2aRA/Ia4PG8FJvaEbqA/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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