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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04493568443f192c3c7b693de83866e61f3c6c1099ee0639b1b2677f2c2a327' 
  AND token = '6kf396z9h9yRfQkGdNbq7robl6C6vRWwOwqlCL4oY6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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