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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ac09bedd48d3d5e90d56f2deef673d5f8ff5b341cfa84c93201cb19d364677' 
  AND token = 'rfPYfDmlG91WJs1SEpacu4V9TBqGJrUR4mneSmdTckg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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