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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9998696f5062c85ef9c7ff5aa2ce3a28b2728fc5b37e5db83634bcc1d9ef966d' 
  AND token = 'S50SenXtA0KmtumowHPgMiSGTeSYbRy5OYIXrfNJib0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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