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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd01572d0aee637527445f35591ff0bd0971b3826565049c5f44120294b46ffe' 
  AND token = '6Q3Q+V3aPVunbTUDJMt8QLyEr5yT1mXwH1QT/UFkIOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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