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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f61f82d6a2147f4bafc421493bb6bf29c8ecf2270b91516d90da33b6fa60136' 
  AND token = '82jsZ2FPaVgu/fLMN4/ALW6EjE5/grkP1rsX/GsC/Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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