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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b6b8534c67dc90e9ac2e02b576d1e550552af4f270c4300d0ecaaf67b43071d' 
  AND token = 'dQpUbq8v7nBt0YocNZ3H6/wtdj9h6WqI5Iqqvxlg/Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00223

JSON explain

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