SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2fd0ee63ab4125a560cc8cda8a3b5ea0621517755433f86fb9e7f627192af92' 
  AND token = 'Klb1ncUeEB+gKx9NTzSHmz2DxRm2P4FGGrC11FgZVEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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