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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60a4dd9f9d38fbca06e404ef7c6720b37925f7ede21b84c7f4363e4d91d70cb' 
  AND token = '1lmFYxfhKldNzCC9rM+mFF1zYzjjpl/s5V/LT1blinY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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