SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ee48d2be43dd17a45e3e7265ea3d5eb1c1dd89dff27105216488bf0b62f8c9' 
  AND token = 'GV8oKSaTU6XrS34Q9b6z2nEq7+L9Bw++ZLoOWggIzuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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