SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b747150d6e69502c649394f737d8933ac24b519eb65e68cf176bf9a859d2a8' 
  AND token = 'zTLQqnZTLdR662gK19C28gCpkBmsXH4UFfq/SiinkyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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