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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403eacdf31e3f3621dd53421228b3c813b502b1d43e8eb6b02a2a6652f6dd971' 
  AND token = '6nk1sT+iMx2MXc8/Qmu8E1oTofyZUTEsZspFAdUnte0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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