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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b283388e5f597bbf878eec12ca8c006bfcf0eed5827a325f9cc9a5cd51b045' 
  AND token = 'meAherhb3Oi7kXiclG0orCATVi7JQJ13ONnekaDaerY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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