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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9daccff57b8e3d01fdd15fc2fe900d51fc040521d124f77038a9c76a94c7c4fa' 
  AND token = 'FHYZyJRQ7XGOovsYj0C1KvV4lTexq4M13JFCMeI+VDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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