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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbdde5584140b40c1f423a3947a3ce3432f12ca7712c2586914c33da8cba533' 
  AND token = 'Nm4pQIOUcSTt48qhEWIUQeYnaz4KjLyErnU8LXtO9qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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