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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde7e8decd25feb5b76836fcfb636ea7e269e1a5965a5c2f2d55ae20b30312d5' 
  AND token = 'bu1KolaIa/nZtPYGUZnsTXkXuZRXBsugDBE6NQ61zpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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