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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1388d227b461bb6c4dbd5b6f6586f42569f0c082734d83d2497cc7aab8760897' 
  AND token = 'ZJPc75WSme2FoL98OLHLXgXvAnvSrkMk8R9Q6I4aRwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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