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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ae32b59ee94f58ebd484bca74547d173ff403d7aa1804d52d0c2d2879ea064' 
  AND token = '1yxw6VO/t+lO6jL/6eH1C5uXhr62Ru1gzttbOS6vnaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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