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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4071be4c512347286e7f033516d23b85e198d3e23b44e03a51ad0a774bc92fa4' 
  AND token = 'S+/OvIXK19Jodq08CgrjrCqHwMS9agmkA+veq5I3mU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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