Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f59cefc0ff39fc11bc45dedee98aa4ec2eba392c13d459ddcffc348d4aba0b' 
  AND token = '4ggsvIwyrGMSU0st7jMmdlWNE5AVPGionZxhpfTxXMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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