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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06fae9a3dd760b32f58a323f6b33f71c92bdaf19e736d05d4b46a68a9eb6971b' 
  AND token = 'F1h7tCtGU5g2wesQhjtIhJo/6NJS1EtiT/Z5mW6aW4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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