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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c15ef90fcbe80598800ca3b987f7c2cbac85df033408b53a703a24ca6b6cae' 
  AND token = 'hLKlUXW8mRb0welJsxcPs3iwC8ws9AgUzwixP6NtDwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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