SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364216a42981ba4598abe13c4d50867283573b40b3b2d89278103b2495125d08' 
  AND token = 'EwxDXKuq4ClvxQ+rrezEQYOgqZlyaKvR+ya8LuajJrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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