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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518535e5468e7b7f498c8553e63e427783e4623c23114f91fc628bbd4d752303' 
  AND token = 'q+cn178AYLgWJjU5Az60bl+QIO0X6o+19P44XzD5tYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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