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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22729983f426d5976d63fd615e2490b20b5316cebcf47f5fc700b49d72d8a8eb' 
  AND token = 'qplDuOrxs4KFfObPg76cwj3M6JSsiKYuJKjbr6/Af2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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