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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '377ba9906076de2fe5a5aad1333eede52458dc695bdcb66e8384f63145d44e67' 
  AND token = '5GN5HfKzceogNuki3ucURBQyHIthPAaMdahkHoHa21A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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