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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b8f6034d9f2dcaa49bb7f948bdf4d1695a301e8793ced5cbf45b3bce4f6dca' 
  AND token = 'xY89gkDuEj7V8ASfuxIVwk9kYoBCEEJKCHR4bzTdo0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00144

JSON explain

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