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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f39d3327e76b22a84306691f0e57ff67733ccd7fa6c74bf502a2d42f12d316a' 
  AND token = 'TXkyZOoGtGak4VWNCmJo83vdZ5ZLhR3f8wzg7XvmbsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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