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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81a23003f9f1ad648e2abcc7d6b07a73e21edb7e20d59c9c3885e47b0fc0cf24' 
  AND token = 'HFCKkXI1JqUFm7EUlP6HOkRCKAhqyEyDJERNSBkq718=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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