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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3fc983d3ec7a4ba98f7e1ff05d9bb63e2b07f0cee831dea6326ed14be41d3d' 
  AND token = 'VaJcRj7nJNWKmiWNI40kdK6V9Jxh3klZBo2MaRNqbZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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