SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb2ce05fda5da61265136b869dbbb8bea68e322aac506dd7991b38a051e7643' 
  AND token = 'TSYMhL1BUzVjaQNKQscmK3Ga1mVjH3OzblYrZfC+pg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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