SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b40723c4a98f62f8549f1ea6d72ce5098f4534ad19352bf2e031fe4f88da7b' 
  AND token = 'CsvNOShj2gXz9Dg1HMdz7xnDzlvrc0s/JBLpzHhp1Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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