SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49f050629d10ef6c7ff3a141769d142d62d68e9ac7cc22e418c90bcca424ef84' 
  AND token = '61YjQv7R/Qf56s+lwRIZqPLvd35H/1JPZXw4AV1K2zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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