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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e361f5330115aca0cccce5e9f72ee12cf88504059d248baab8a74f157b011f' 
  AND token = 'tYXINmaGN89ZuxEBQpF/ytJzeEehXU4xRklDdLTNcaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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