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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b809d1a74bab486ced487b5ae16c2307645766cb5245fefda6f0e0811d6bd0e' 
  AND token = 'lJqyozuYIJz02EiKXwsNj1i57WGEkmv+2KfEh4k4FPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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