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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8796d07269f4212fd0db67bb86d240975bef1f04aaa9987de9ed0e9e25b60fa' 
  AND token = '3KOgcvFlc6XdMTTUIqUzX5F3ggmrhwQjg5hDhSSUqDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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