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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85aa2e111262cbccd3db17aee7edaf4d8043f80027639e6f350d34edc56186e3' 
  AND token = '45Xxod0BqIiNl+bwvP6ocFywLUPcOM6WzIFsc3Syofg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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