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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f43a1ac9d3fb3bf0d7ce97e4c2349b30f57f877da06bbbc3266ce66e38344c88' 
  AND token = 'L3NI6P/lu8MLm5LfuBT9MwA06V44a7K5m3iF+s+mnE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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