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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b5e17355a29569621b6df1e3d82c41f4056d18c032117e5717cead154d6c92' 
  AND token = 'sf3Gbq16EzlxB+5SvV5mxil3lVzMAH3WtUeYyptIDQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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