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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c54e80f64660078901b7d44463a886e785b751344d0c7d4a83d3b8429b9ac1' 
  AND token = '3Dg6lfsmo1KN/Htuml/gjKztVDBSgiywdsBD8vs9CeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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