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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879e00d7c56aa506f863ed2b1e18420a6d1c29746c225a992e28ec70e1283175' 
  AND token = 'XD4qUg8dxSDyV9pT4D/TOSDpnx6CD8H2jGC0M5TaelI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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