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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78817271176c499fd03cf761112bc6e2bdacdfe6697289b7957fa1097461253c' 
  AND token = 'dSr8Tp4jY4R3799IyKIoekVt4hcilKb6XlCbtx+lHBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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