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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '379bc5623126f4f41fa9d9278819e71ab28ace33f4a33fdd75290b3df11adae7' 
  AND token = 'XXWASjJzZZkSWCXpT5pkMHBXr3yZUVhP0COj14Xg9eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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