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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e381f320722b72e679ceb081e57d163a1fd34671bf4939ce8d3b7d3e9cd48b' 
  AND token = 'ZDsLscWY3lqZWh+tExKC//Weh0URxCMi67t9kKeV4OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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