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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db92fe193c78cd2df19892099906ce9ebd4ddf32880b76cd66f329ce5a2b089' 
  AND token = 'vKSMDUJnO18okae6x1pobBSDB66SUkNFUlDEjRxqq6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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