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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77482f62d90dcce60f9583e9cd2a41d99a8af0e858805c8d6daf23d724aa7c4' 
  AND token = 'Z1RHaYl+HFhd2ItaThuDhHu71+3VKHYAiy1USecisto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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