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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74dc9a0bfd6be6eb72b81ee2cd742a2eeaa5dae1f7833645b3da2acb8635296d' 
  AND token = '/mvqQmp6vfWy9t6qZCC6JlCE6rrj2UrRiAmpVemTZ+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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