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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e57fc17e9dbc7ac8f98ed8524d104e259193f6c911bc5f958dc136a5cec1a541' 
  AND token = 'dWog18NS6REYcGfOUdIgXUPAMj80mcplUkNXd7xZ0a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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