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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4c75c9a84718e8ea403b4ce2316b46a80bc6ad848362bda7aa82fc16e6e78e' 
  AND token = 'emkXkdeiDHYqkmMS6qjcqfs9XCSmM1Ib4XxOwFoRSWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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