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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa421429b8cacdf9a307e97c5a18e6bdf496d666d810a99404891688fa88277a' 
  AND token = 'rv6TknT6TtS0fa7UNVZGzv++K4b44nsXFwXJVF2ogiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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