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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8935adcfddcecfc744bcbd2742f5d4e19a0ee6921787c6f245f26b04d3d5df01' 
  AND token = 'cL+A4YynRB/j7zsihu6M2IeyoTcdeRVOSJZw7cwkVs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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