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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a70da7c4c6d3faa90b65a93cec5c8ced71378fc07db92f9b680f59cee1d53f0' 
  AND token = 'RsupsfqUeGWY5Vac64d3rmKhOyeczeYADrPFnprtjhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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