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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f26588c43e449bb3bee9b76533693f7858eb804d9e4a71612252ed8be3801de' 
  AND token = '2FM4lu1dsQdNuC2P8Z9iZ/k7bcn8V7vy8B6bfJH1ehA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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