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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f74d7e38add54745dd6c65716b67dc700dcfa735cdbec8acae07714cdc37de25' 
  AND token = 'hGJ8CNL5j0JEX5b++medRrFCPAWm+FIxL/4e6l2fq8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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