SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1e02daed716482e47f47e94e612839489c64a22e27b20a885c57706883e1a6' 
  AND token = 'fKYV2MTjjIJzzvjcSpPYlsZB3Mqb5BxbayJh/LMMiKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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