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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a9032849a978572657dc3cec8aadadad6fbd55de90642f0a28febb72ad0fff' 
  AND token = 'JN2y/92B2n5N2PgXu3dLZ+75GtMbF5o9QME8U7/0vG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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