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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaab980a5763c202ad1d87be19027200ddf06840a4a2c5493003b4dab275e955' 
  AND token = 'zd869kUxJQukcz9uuiv9cwYw9GV9cBc+mVFrgVZd7nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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