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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab829fe11f7c41ac6cee10a79db0ec5d22b7bc4e721a5814b34726f046353849' 
  AND token = 'mAB6tqD8WUlw3IS8aogdVHBuS9zyoxILZeQFA07c++8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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