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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a3f9668ace79b0b827dcbdde42e032181b6a89279ca19da7bda0aedcea3aab6' 
  AND token = 'wpVl9up2W1RaXVZ2BepZS35XxNsntGIu/PPDJLOpTLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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