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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234b8c42fae93c1cf677867ccda96980a0860142f45a17fdc1e4522f84c9a4fc' 
  AND token = 'UHFQzYTkPGB2KZXsmza8SgHAf12ypdEcEWWCxd2J15s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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