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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795d111ecb497bd89c0afd4d92919d1923ad959c39f71c49efd1d745eacb5c06' 
  AND token = 'EtLy0oomblGETovaR39f5izg4uj/Uk5c7XeRPkj4qWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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