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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6083c566362fe054d8cdd25e6e8dae2b74ced7ac87b6b91959f4a48ef83ca9c4' 
  AND token = 'B0sdVZxL+/HE5qerI+VHMNInb4xnrF1vqt+DhpHudhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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