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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd008a986dcd37d44add3680d47216718bd716939f09d47b390bc4d499584247e' 
  AND token = 'v+8SR0Xkh6nXWNqh9Q4PqRWv62LMxx/dexMmyageTK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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