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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ecbf07412507739c06c6cb770013f2fca8c657df46045c111cb21032138346' 
  AND token = '8By/XW2fF7+pYpgjGdY6QA7d/rTvSHjMQ1u57GotuyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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