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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d90c87ded41e7424de7d04d2c7976fe340ed3594e310f40ab4d03bf75e67e1' 
  AND token = 'dcQe1mlgI4j0mwJjtW90TIGeToWB+R1yXQ+/AkKZiGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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