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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad225846996b3d030ce02dd814fc8902fef80f5f2787c9884ef3c2387c106cd' 
  AND token = '5LacSXVTsSQZEHiexbZS5AZIn+HY83j9X+rDlShpGSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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