SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d06eb1a573c7fe5f8f2a47a9cdea350859c7cbe506fb2ed29922da3910302e' 
  AND token = '/pMgF1maCEL233A+8oJGYYBlr/AKds7O2qn8NPhmjsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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